Code:
#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[]=TEXT("KeyView1");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires Windows NT/XP!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, TEXT("Keyboard Message Viewer #1"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClientMax, cyClientMax, cxClient, cyClient, cxChar, cyChar;
static int cLinesMax, cLines;
static PMSG pmsg;
static RECT rectScroll;
static TCHAR szTop[]=TEXT("Message Key Char ")
TEXT("Repeat Scan Ext ALT Prev Tran");
static TCHAR szUnd[]=TEXT("_______ ___ ____ ")
TEXT("______ ____ ___ ___ ____ ____");
static TCHAR * szFormat[2]={TEXT("%-13s %3d %-15s%c%6u %4d %3s %3s %4s %4s"),
TEXT("%13s 0x%04X%1s%c %6u %4d %3s %3s %4s %4s")};
static TCHAR * szYes=TEXT("Yes");
static TCHAR * szNo=TEXT("No");
static TCHAR * szDown=TEXT("Down");
static TCHAR * szUp=TEXT("Up");
static TCHAR * szMessage[]={
TEXT("WM_KEYDOWN"), TEXT("WM_KEYUP"),
TEXT("WM_CHAR"), TEXT("WM_DEADCHAR"),
TEXT("WM_SYSKEYDOWN"), TEXT("WM_SYSKEYUP"),
TEXT("WM_SYSCHAR"), TEXT("WM_SYSDEADCHAR")};
HDC hdc;
int i, iType;
PAINTSTRUCT ps;
TCHAR szBuffer[128], szKeyName[32];
TEXTMETRIC tm;
switch(message)
{
case WM_CREATE:
case WM_DISPLAYCHANGE:
//Get maximum size of the client area
cxClientMax=GetSystemMetrics(SM_CXMAXIMIZED);
cyClientMax=GetSystemMetrics(SM_CYMAXIMIZED);
//get character size for fixed pitch font
hdc=GetDC(hwnd);
//allocate memory for display lines
if(pmsg){
free(pmsg);}
cLinesMax=cyClientMax/cyChar;
pmsg = malloc(cLinesMax * sizeof(MSG));
cLines=0;
//fall through
case WM_SIZE:
if(message=WM_SIZE)
{
cxClient=LOWORD(lParam);
cyClient=HIWORD(lParam);
}
//calculate scrolling rectangle
rectScroll.left=0;
rectScroll.right=cxClient;
rectScroll.top=cyChar;
rectScroll.bottom=cyChar * (cyClient / cyChar);
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case WM_KEYDOWN:
case WM_KEYUP:
case WM_CHAR:
case WM_DEADCHAR:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_SYSCHAR:
case WM_SYSDEADCHAR:
//rearrange storage array
for(i=cLinesMax-1; i>0; i--)
{
pmsg[i]=pmsg[i-1];
}
//store new message
pmsg[0].hwnd=hwnd;
pmsg[0].message=message;
pmsg[0].wParam=wParam;
pmsg[0].lParam=lParam;
cLines=min(cLines + 1, cLinesMax);
//scroll up the display
ScrollWindow(hwnd, 0, -cyChar, &rectScroll, &rectScroll);
break; //i.e., call DefWindowProc so Sys Messages work
case WM_PAINT:
hdc=BeginPaint(hwnd, &ps);
SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT));
SetBkMode(hdc, TRANSPARENT);
TextOut(hdc, 0, 0, szTop, lstrlen(szTop));
TextOut(hdc, 0, 0, szUnd, lstrlen(szUnd));
for(i=0; i<min(cLines, cyClient/cyChar-1); i++)
{
iType = pmsg[i].message == WM_CHAR ||
pmsg[i].message == WM_SYSCHAR ||
pmsg[i].message == WM_DEADCHAR ||
pmsg[i].message == WM_SYSDEADCHAR;
GetKeyNameText(pmsg[i].lParam, szKeyName, sizeof(szKeyName)/sizeof(TCHAR));
TextOut(hdc, 0, (cyClient/cyChar - 1 - i) * cyChar, szBuffer,
wsprintf(szBuffer, szFormat[iType],
szMessage[pmsg[i].message - WM_KEYFIRST],
pmsg[i].wParam,
(PTSTR)(iType ? TEXT(" ") : szKeyName),
(TCHAR)(iType ? pmsg[i].wParam : ' '),
LOWORD(pmsg[i].lParam),
HIWORD(pmsg[i].lParam) & 0xFF,
0x01000000 & pmsg[i].lParam ? szYes : szNo,
0x20000000 & pmsg[i].lParam ? szYes : szNo,
0x40000000 & pmsg[i].lParam ? szDown : szUp,
0x80000000 & pmsg[i].lParam ? szUp : szDown));
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
Thanks again!
